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W. B. MARTINDALE; TIME STAMP AOTUATED BY ELEGTRO MAGNETS.

No. 449,759. Patented Apr. 7,1891.

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UNITED STATES PATENT OFFICE.

WARREN B. MARTINDALE, OF KENOSHA, IVISCONSIN.

TIME-STAMP ACTUATED BY ELECTRO-MAGNETS.

SPECIFICATION forming part of Letters Patent No 449,759, dated April '7,1891.

Application filed December 15, 1890- Serial No. 374.695. (N0 model.)Patented in England February 26, 1889, No. 3,394; in France February 26,1889, No. 196,316, and in Germany November '7, 1889, No. 50,454.

To aZZ whom it may concern:

Be it known that I, WARREN B. MARTIN- DALE, of Kenosha, in the county ofKenosha and State of Wisconsin, have invented certain new and usefulImprovements in Time Stamps Actuated by Electro-Magnets, (the same beingembraced in the British Letters Patent issued to me and hearing date the26th day of February, 1889, No. 3,394; in the French patent, No.106,316, bearing date February 26, 1889, and in the German patent, No.50,454, granted November 7, 1889;) and I do hereby declare that thefollowing isa full and exact description thereof, reference being had tothe accompanying drawings, and to the letters of reference markedthereon, making a part of this specification.

My invention has for its object to provide a simple effective electricdate and time stamp having all its operative mechanism embraced in itshead or movable part independently o'l' anyfixed and rigid supporttherefor, whereby the stamp is not only rendered more compact, but willadmit of being carried freely bodily to and fro over the papers to beimprinted.

It consists in the combination, with amovable head, substantially ashereinafter de scribed and claimed, of suitable indicating mechanism andan electro-magnet for actuating the same, both carried with the head topartake of its movements.

In the accompanying drawings, Figure l is a vertical section of myimproved electro-magnetic hand time-stam p in a plane transversely tothe axis of the type-wheels, (see line 00 as of Fig. 2;) Fig. 2, ahorizontal section of the same in line 1 y of Fig. 1, affording'a topview of its operative mechanism, and Fig. 3 asectional elevation showingmy invention as applied to a stamp having a swinging arm.

Similar letters indicate like parts in all of the figures.

A represents the casing or movable head of a hand-stamp, adapted to becarried freely and independently over the surface of the books or paperto be stamped.

B is an electro-magnet fitted in the rear portion of the casing A,preferably in an upright position, as shown in Fig. 1, and O is thearmature for said magnet, mounted to swing over its poles upon the upperend of a lever I), Fig. 1, Whose lower end is pivoted at e to the baseof the magnet. A spring M, attached to the upper end of the lever D,operates to retract the armature, said movement being limited by a stopN. ,1

The magnet B is connected by suitable conducting-wires F F with abattery F and an intermediate clock G, which operates in the customarymanner to make and break the electric circuit at regular intervals,thereby actuating or energizing the magnet intermittently in synchronismwith the movements of the clock.

The indicating mechanism for the stamp is mounted within the casingdirectly in front of the base of the magnet, in close proximity thereto.Said indicating mechanism consists, as is usual, of aseries of date andtime wheels L L, revolving upon an axis at right angles to thearmature-lever D, and which are adapted to be actuated by means ofreciprocating pawls II II, carried by a cross-bar I, attached to thearmature-lever D. These wheels L L are mounted in position to be broughtto line of print in the usual manner at the bottom of the casing and inconnection, if so desired, with fixed type or characters K, attached tothe bottom of the casing, as shown in Fig. 1.

The details of the construction, arrangement, and operation of the dateand time wheels form no part of my present invention, and may be of anyapproved description.

The indicating mechanism shown in the drawings is in its generalconstruction and mode of operation substantially the same as thatdescribed in the Letters Patent of the United States granted to Ernst R.Malmborg on the 14th day of October, 1890, No. 438,166.

The transverse bar I, to which the pawls H are pivoted, is attached tothe armature-lever D intermediate its pivot and its armature, and sincethe lever extends in a direction parallel with the line of movementfollowed by the casing or head when an impression is to be made with thestamp, the danger of an accidental movement of the lever and pawls,which with the customary forms of stamps is liable to occur by reason ofthe jar of the blow in producing an impression, is wholly avoided.

The intermittent action of the magnet B, produced by the clock actuatingthe lever D and the pawls carried thereby, will operate the indicatingmechanism and automatically maintain its proper adjustment to indicatethe exact time of day as well as the day and the month.

The printing-wheels L may be inked as required by means of anindependent inkingpad, as is customary in the use of simple hand-stampsor by means of an inking-ribbon carried over the same, as shown at r inFig.

3, or otherwise by means of any of the automatic appliances for thepurpose well known to the art.

Instead of mounting theactuating-magnet B within the movable head orcasing in a vera pivoted or swinging arm, placing the magtical position,as shown in Fig. 1, I contemplate, as a modification of my device incases where the movable head is to be carried upon net in a horizontalposition, as shown in Fig. 3, in which A represents the head or casingcarried upon a swinging arm J, whereby the stamp is made to drop upon aplaten P when depressed.

The magnet B is fitted in a, horizontal position in the portion of thearm next to the head, so as to be carried with the head and partake ofits movement, and its armature O swings to and from it upon the lever D,pivoted in front of it in the lower portion of the casing.

The support of the magnet in connection with the movable head and theoperation of the lever and the pawls which are pivoted thereto toactuate the indicating mechanism are substantially similar in allrespects to that hereinbefore described.

I claim as my invention- 1. The combination, with a movable headcarrying printing-wheels adapted to be applied by the movement of thehead to the surface to be imprinted, of an electro-magnet carried withsaid head to partake of its movements, an armature for said magnet, anda device for transmitting the movement of the armature to theprinting-wheels, substantially in the manner and for the purpose hereinset forth. 1

2. The combination, in a time-stamp, with its printing-wheels, of anelectro-magnet cararmature for the same adapted to swing transverselyover its upper end, a lever carryin g said armature and pivoted at thelower end of the magnet, and a pawl actuating the indicating mechanismand pivoted to said lever intermediate its pivot and the armature,substantially in themanner and for the purpose hcrein set forth.

In testimony whereof I have signed my name to this specification in thepresence of two'subscribingwitnesses.

WARREN B. MARTINDALE.

Witnesses:

A. N. J ESBERA, E. M. WATSON.

